qx.Class.define("ui.service.UsuarioService", {
			extend : qx.core.Object,
			members : {
				login : function(username, password) {
					var req = new qx.io.request.Xhr("/rpc/login", "POST");
					var params = {
						"uid" : username,
						"pwd" : password
					};
					var resp = null;
					req.setRequestData(params);
					req.send();
					req.addListener("success", function(e) {
								var req = e.getTarget();
								resp = req.getResponse();
							}, this);
					return resp;
				}
			}
	